iOS Musician Apps (50) Instrument Sounds is Keyboards, Free

Syntorial is a synthesizer training app, that will teach you how to program synth patches by ear.

Accelerometer Synthesizer and Bluetooth MIDI Controller.

4Waves Synth AUv3 is an easy to use synthesizer with a powerful sound.

Grand Piano auv3 brings you the sound of the classic instrument to your iPad and iPhone.

Nanologue boasts a wide scope of inspiring sounds and professional sound effects, sporting a straightforward multi-touch interface and a great-sounding monophonic synthesizer.

Primer is a synth equipped with the most essential controls and nothing more.

Make music in seconds. Share, remix and collaborate with music makers all over the world.

Triqtraq LE is a free limited edition of the critically acclaimed music app Triqtraq - Jam Sequencer.

AudioKit Synth One is a completely free & open-source professional iOS Synthesizer. 

Play the vibe. Hear the magic. Syntronik is IK’s cutting-edge synthesizer that features the sound of the most iconic machines to ever grace the planet.

Modulin is a customizable synthesizer. It allows for unique personal expression while providing a wide spectrum of visual feedback.

Fed up with standardized presets and instruments? Feel lost in overcomplex filters and effects? Don’t wanna sound like everyone else? BLEASS is just the right instrument for you: it unleashes your inner musical creativity by bringing music production and performance to its very core: play, perform, compose beats and melodies in a new yet intuitive way thanks to its multitrack sequencer, synthesizer and drum machine.

AutoArp turns your iPhone (or iPod Touch) into a musical instrument that is halfway between a traditional auto-harp zither and an arpeggiated analogue-style synth.

Spectrum is a collection of Audio Unit ports of popular eurorack synthesizer modules.

HOWL is a simple vocoder/synthesizer. It uses formants to simulate the human voice and a pitch-space keyboard to help you find interesting melodies.

iTuttle is a Subtractive Monophonic/Paraphonic Synthesizer.

CHAiOS SYNTH 2 is a synthesizer/melody generator that creates unique melodies with just one tap.

LCW-2 mono is a little complicated synthesizer based on ToyTone and implements several experimental functions.

RD4 - Groovebox is a music making app with virtual analog synthesizers, drum machines and effects.

Beatonal is an accessible music making app, enabling you to easily create and share your musical ideas using the built-in synthesizers and drum machine.